Right. Everyone values games at different monetary values.
Some people, for example, would pay 500 dollars to play the new Metal Gear Solid. I'm not sure that would be a large crowd of people, but definitely some fans are dedicated enough that they would buy a 440 dollar system to play the game, then the game at 60 dollars, if that were the necessary requirement.
I think it's reasonable to assume that most people don't want to pay 360 dollars to play the new Bayonetta. You can be a big fan of the franchise and still not want to pay that much; I'm not sure how much a "big fan" has to be willing to pay, but surely someone willing to pay 150 dollars would qualify as a "big fan."
If some people see nothing else of interest on the Wii U system, then that is what this announcement is currently tantamount to; Bayonetta is the only game they want, so playing it has a barrier of entry of 360 dollars. However, I'm sure many, including Morma Pope, would be happy to buy the system if several other games they wanted appeared on the system -- then the cost of the system would no longer be placed exclusively on Bayonetta, and could be dispersed among the several games he wanted and planned to buy.
I just paid nearly $800 to own the Fate Zero anime series. Im pretty sure a sizeable amount of people will shell out to own the latest version of something they love. I ended up getting a Ps3 for the Uncharted series because I fully enjoyed the idea and when Uncharted 2 came out I knew I had to have it. When Forza came out on 360 I jumped in as well. These are the kinds of things that get people to take the plunge on a new system. People have long criticized nintendo for not doing this sort of thing, and now that they do there is this backlash. It seems to me that people are more loyal to a platform than the games they supposedly love. Its kind of...backwards.